mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-30 21:45:27 +00:00
331 lines
7.2 KiB
C++
331 lines
7.2 KiB
C++
#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <string.h>
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#include <libgen.h>
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#include <magisk.h>
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#include <utils.h>
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#include <resetprop.h>
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#include <db.h>
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#include <selinux.h>
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#include "magiskhide.h"
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using namespace std;
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static pthread_t proc_monitor_thread;
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static const char *prop_key[] =
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{ "ro.boot.vbmeta.device_state", "ro.boot.verifiedbootstate", "ro.boot.flash.locked",
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"ro.boot.veritymode", "ro.boot.warranty_bit", "ro.warranty_bit", "ro.debuggable",
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"ro.secure", "ro.build.type", "ro.build.tags", "ro.build.selinux", nullptr };
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static const char *prop_value[] =
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{ "locked", "green", "1",
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"enforcing", "0", "0", "0",
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"1", "user", "release-keys", "0", nullptr };
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void manage_selinux() {
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char val;
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int fd = xopen(SELINUX_ENFORCE, O_RDONLY);
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xxread(fd, &val, sizeof(val));
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close(fd);
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// Permissive
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if (val == '0') {
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chmod(SELINUX_ENFORCE, 0640);
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chmod(SELINUX_POLICY, 0440);
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}
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}
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static void hide_sensitive_props() {
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LOGI("hide_utils: Hiding sensitive props\n");
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// Hide all sensitive props
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for (int i = 0; prop_key[i]; ++i) {
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auto value = getprop(prop_key[i]);
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if (!value.empty() && value != prop_value[i])
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setprop(prop_key[i], prop_value[i], false);
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}
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}
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// Leave /proc fd opened as we're going to read from it repeatedly
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static DIR *procfp;
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void crawl_procfs(const function<bool (int)> &fn) {
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rewinddir(procfp);
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crawl_procfs(procfp, fn);
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}
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void crawl_procfs(DIR *dir, const function<bool (int)> &fn) {
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struct dirent *dp;
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int pid;
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while ((dp = readdir(dir))) {
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pid = parse_int(dp->d_name);
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if (pid > 0 && !fn(pid))
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break;
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}
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}
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bool proc_name_match(int pid, const char *name) {
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char buf[4019];
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FILE *f;
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#if 0
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sprintf(buf, "/proc/%d/comm", pid);
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if ((f = fopen(buf, "re"))) {
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fgets(buf, sizeof(buf), f);
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fclose(f);
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if (strcmp(buf, name) == 0)
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return true;
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} else {
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// The PID is already killed
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return false;
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}
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#endif
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sprintf(buf, "/proc/%d/cmdline", pid);
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if ((f = fopen(buf, "re"))) {
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fgets(buf, sizeof(buf), f);
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fclose(f);
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if (strcmp(basename(buf), name) == 0)
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return true;
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}
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return false;
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#if 0
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sprintf(buf, "/proc/%d/exe", pid);
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ssize_t len;
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if ((len = readlink(buf, buf, sizeof(buf))) < 0)
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return false;
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buf[len] = '\0';
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return strcmp(basename(buf), name) == 0;
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#endif
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}
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static void kill_process(const char *name) {
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crawl_procfs([=](int pid) -> bool {
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if (proc_name_match(pid, name)) {
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if (kill(pid, SIGTERM) == 0)
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LOGD("hide_utils: killed PID=[%d] (%s)\n", pid, name);
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return false;
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}
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return true;
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});
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}
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void clean_magisk_props() {
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getprop([](const char *name, auto, auto) -> void {
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if (strstr(name, "magisk"))
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deleteprop(name);
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}, nullptr, false);
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}
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static int add_list(const char *pkg, const char *proc = "") {
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if (proc[0] == '\0')
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proc = pkg;
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for (auto &hide : hide_set)
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if (hide.first == pkg && hide.second == proc)
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return HIDE_ITEM_EXIST;
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// Add to database
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char sql[4096];
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snprintf(sql, sizeof(sql),
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"INSERT INTO hidelist (package_name, process) VALUES('%s', '%s')", pkg, proc);
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char *err = db_exec(sql);
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db_err_cmd(err, return DAEMON_ERROR);
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LOGI("hide_list add: [%s/%s]\n", pkg, proc);
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// Critical region
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{
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MutexGuard lock(monitor_lock);
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hide_set.emplace(pkg, proc);
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}
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kill_process(proc);
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return DAEMON_SUCCESS;
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}
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int add_list(int client) {
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char *pkg = read_string(client);
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char *proc = read_string(client);
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int ret = add_list(pkg, proc);
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free(pkg);
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free(proc);
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update_uid_map();
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return ret;
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}
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static int rm_list(const char *pkg, const char *proc = "") {
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{
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// Critical region
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MutexGuard lock(monitor_lock);
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bool remove = false;
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auto next = hide_set.begin();
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decltype(next) cur;
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while (next != hide_set.end()) {
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cur = next;
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++next;
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if (cur->first == pkg && (proc[0] == '\0' || cur->second == proc)) {
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remove = true;
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LOGI("hide_list rm: [%s]\n", cur->second.data());
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hide_set.erase(cur);
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}
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}
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if (!remove)
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return HIDE_ITEM_NOT_EXIST;
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}
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char sql[4096];
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if (proc[0] == '\0')
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snprintf(sql, sizeof(sql), "DELETE FROM hidelist WHERE package_name='%s'", pkg);
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else
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snprintf(sql, sizeof(sql),
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"DELETE FROM hidelist WHERE package_name='%s' AND process='%s'", pkg, proc);
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char *err = db_exec(sql);
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db_err(err);
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return DAEMON_SUCCESS;
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}
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int rm_list(int client) {
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char *pkg = read_string(client);
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char *proc = read_string(client);
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int ret = rm_list(pkg, proc);
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free(pkg);
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free(proc);
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if (ret == DAEMON_SUCCESS)
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update_uid_map();
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return ret;
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}
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static void init_list(const char *pkg, const char *proc) {
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LOGI("hide_list init: [%s/%s]\n", pkg, proc);
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hide_set.emplace(pkg, proc);
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kill_process(proc);
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}
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#define LEGACY_LIST MODULEROOT "/.core/hidelist"
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bool init_list() {
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LOGD("hide_list: initialize\n");
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char *err = db_exec("SELECT * FROM hidelist", [](db_row &row) -> bool {
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init_list(row["package_name"].data(), row["process"].data());
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return true;
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});
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db_err_cmd(err, return false);
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// Migrate old hide list into database
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if (access(LEGACY_LIST, R_OK) == 0) {
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file_readline(LEGACY_LIST, [](string_view s) -> bool {
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add_list(s.data());
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return true;
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});
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unlink(LEGACY_LIST);
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}
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// Add SafetyNet by default
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rm_list(SAFETYNET_COMPONENT);
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rm_list(SAFETYNET_PROCESS);
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init_list(SAFETYNET_PKG, SAFETYNET_PROCESS);
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init_list(MICROG_SAFETYNET, SAFETYNET_PROCESS);
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update_uid_map();
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return true;
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}
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void ls_list(int client) {
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FILE *out = fdopen(recv_fd(client), "a");
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for (auto &hide : hide_set)
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fprintf(out, "%s|%s\n", hide.first.data(), hide.second.data());
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fclose(out);
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write_int(client, DAEMON_SUCCESS);
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close(client);
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}
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static void set_hide_config() {
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char sql[64];
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sprintf(sql, "REPLACE INTO settings (key,value) VALUES('%s',%d)",
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DB_SETTING_KEYS[HIDE_CONFIG], hide_enabled);
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char *err = db_exec(sql);
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db_err(err);
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}
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static inline void launch_err(int client, int code = DAEMON_ERROR) {
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if (code != HIDE_IS_ENABLED)
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hide_enabled = false;
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if (client >= 0) {
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write_int(client, code);
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close(client);
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}
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pthread_exit(nullptr);
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}
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#define LAUNCH_ERR launch_err(client)
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void launch_magiskhide(int client) {
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if (SDK_INT < 19)
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LAUNCH_ERR;
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if (hide_enabled)
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launch_err(client, HIDE_IS_ENABLED);
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if (access("/proc/1/ns/mnt", F_OK) != 0)
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launch_err(client, HIDE_NO_NS);
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hide_enabled = true;
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set_hide_config();
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LOGI("* Starting MagiskHide\n");
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if (procfp == nullptr && (procfp = opendir("/proc")) == nullptr)
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LAUNCH_ERR;
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hide_sensitive_props();
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// Initialize the mutex lock
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pthread_mutex_init(&monitor_lock, nullptr);
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// Initialize the hide list
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if (!init_list())
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LAUNCH_ERR;
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// Get thread reference
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proc_monitor_thread = pthread_self();
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if (client >= 0) {
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write_int(client, DAEMON_SUCCESS);
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close(client);
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client = -1;
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}
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// Start monitoring
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proc_monitor();
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// proc_monitor should not return
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LAUNCH_ERR;
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}
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int stop_magiskhide() {
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LOGI("* Stopping MagiskHide\n");
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hide_enabled = false;
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set_hide_config();
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pthread_kill(proc_monitor_thread, SIGTERMTHRD);
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return DAEMON_SUCCESS;
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}
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void auto_start_magiskhide() {
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db_settings dbs;
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get_db_settings(dbs, HIDE_CONFIG);
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if (dbs[HIDE_CONFIG]) {
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new_daemon_thread([](auto) -> void* {
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launch_magiskhide(-1);
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return nullptr;
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});
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}
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}
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